I’ve have been finding a lot of posts about DMC not delivering and not responding. This has also happened to me recently. Linden Labs may not be responsible for the money loss from a particular vendor who takes money and does not deliver a product. However, if a vendor has no intention of delivering a product and continues to use the market place, or an in world store, as a means to defraud people Linden Labs would be responsible for removing the said advertisement from their webpage and/or their in world store.